How to insert an array into an existing NSMutableArray at a specific index

Question

I've tried using

NSMutableArray *existingArray = [@[@"1", @"3", @"4"] mutableCopy];
NSArray *newItems = @[@"2", @"2", @"2", @"2"];
[existingArray insertObjects:newItems atIndexes:[NSIndexSet indexSetWithIndex:1]];

Above code ends up crashing because i'm suppose to provide all indexes for all new items.

What i want is to be able to insert newItems at position 1 of existingArray preserving the order of newItems in final array too.

Is there an easy way to provide all those indexes?

Answer 1

Correct answer without comments...

NSInteger position = 1;
NSRange range = NSMakeRange(position, newItems.count);
NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:range];
[existingArray insertObjects:newItems atIndexes:indexSet];

Answer 2

You can insert by "replacing" an empty range:

[existingArray replaceObjectsInRange:NSMakeRange(1, 0) withObjectsFromArray:newItems];